blocks|key|26537|text|我最终创建了自定义的InputFormatter，这非常简单，但是如果有更好的替代方案，非常欢迎你写一个答案！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|26538|public+class+XDocumentInputFormatter+:+InputFormatter,+IInputFormatter,+IApiRequestFormatMetadataProvider
{
++++public+XDocumentInputFormatter()
++++{
++++++++SupportedMediaTypes.Add("application/xml");
++++}

++++protected+override+bool+CanReadType(Type+type)
++++{
++++++++if+(type.IsAssignableFrom(typeof(XDocument)))+return+true;
++++++++return+base.CanReadType(type);
++++}

++++public+override+async+Task<InputFormatterResult>+ReadRequestBodyAsync(InputFormatterContext+context)
++++{
++++++++var+xmlDoc+=+await+XDocument.LoadAsync(context.HttpContext.Request.Body,+LoadOptions.None,+CancellationToken.None);
++++++++return+InputFormatterResult.Success(xmlDoc);
++++}
}|code-block|syntax|javascript|26539|在startup.cs中注册XDocumentInputFormatter|26540|public+void+ConfigureServices(IServiceCollection+services)
{
++++services.AddMvc(options+=>+options.InputFormatters.Insert(0,+new+XDocumentInputFormatter()));
}|26541|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I've ended up creating custom InputFormatter, which was pretty straitforward, but if there is better alternative, you are very welcome to write an answer!

<pre><code>public class XDocumentInputFormatter : InputFormatter, IInputFormatter, IApiRequestFormatMetadataProvider
{
 public XDocumentInputFormatter()
 {
 SupportedMediaTypes.Add("application/xml");
 }

 protected override bool CanReadType(Type type)
 {
 if (type.IsAssignableFrom(typeof(XDocument))) return true;
 return base.CanReadType(type);
 }

 public override async Task&lt;InputFormatterResult&gt; ReadRequestBodyAsync(InputFormatterContext context)
 {
 var xmlDoc = await XDocument.LoadAsync(context.HttpContext.Request.Body, LoadOptions.None, CancellationToken.None);
 return InputFormatterResult.Success(xmlDoc);
 }
}
</code></pre>

Register the XDocumentInputFormatter in startup.cs

<pre><code>public void ConfigureServices(IServiceCollection services)
{
 services.AddMvc(options =&gt; options.InputFormatters.Insert(0, new XDocumentInputFormatter()));
}
</code></pre>

blocks|key|2692216|text|对于Liero给出的答案，你应该使用一个StreamReader，这样你就可以支持多种编码了。使用UTF-8、UTF-16和ASCI声明头测试了我的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2692217|更改XDocumentInputFormatter中的方法：|2692218|public+override+async+Task<InputFormatterResult>+ReadRequestBodyAsync(InputFormatterContext+context)
{
++++var+xmlDoc+=+await+XDocument.LoadAsync(context.HttpContext.Request.Body,+LoadOptions.None,+CancellationToken.None);
++++return+InputFormatterResult.Success(xmlDoc);
}|code-block|syntax|javascript|2692219|至下图|2692220|public+override+async+Task<InputFormatterResult>+ReadRequestBodyAsync(InputFormatterContext+context)+{
++++++++//+Use+StreamReader+to+convert+any+encoding+to+UTF-16+(default+C#+and+sql+Server).
++++++++using+(var+streamReader+=+new+StreamReader(context.HttpContext.Request.Body))+{
++++++++++++var+xmlDoc+=+await+XDocument.LoadAsync(streamReader,+LoadOptions.None,+CancellationToken.None);
++++++++++++return+InputFormatterResult.Success(xmlDoc);
++++++++}
++++}|2692221|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Just a change for the answer given by Liero, you should use a StreamReader, so you can support multiple encodings. Tested my solution with UTF-8, UTF-16 and ASCI declaration header.

Change the Method from XDocumentInputFormatter:

<pre><code>public override async Task&lt;InputFormatterResult&gt; ReadRequestBodyAsync(InputFormatterContext context)
{
 var xmlDoc = await XDocument.LoadAsync(context.HttpContext.Request.Body, LoadOptions.None, CancellationToken.None);
 return InputFormatterResult.Success(xmlDoc);
}
</code></pre>

To below

<pre><code>public override async Task&lt;InputFormatterResult&gt; ReadRequestBodyAsync(InputFormatterContext context) {
 // Use StreamReader to convert any encoding to UTF-16 (default C# and sql Server).
 using (var streamReader = new StreamReader(context.HttpContext.Request.Body)) {
 var xmlDoc = await XDocument.LoadAsync(streamReader, LoadOptions.None, CancellationToken.None);
 return InputFormatterResult.Success(xmlDoc);
 }
 }
</code></pre>

blocks|key|25141|text|这些解决方案可以工作，但在.NET核心3中有一个缺点-它们会导致异常(在调用XDocument.LoadAsync内部)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|25142|不允许System.InvalidOperationException:同步操作。调用ReadAsync或将AllowSynchronousIO设置为true。|offset|length|style|BOLD|25143|以下是我用FileBufferingReadStream修改的解决方案(灵感来自Microsoft.AspNetCore.Mvc.Formatters.XmlSerializerInputFormatter)的代码|25144|public+override+async+Task<InputFormatterResult>+ReadRequestBodyAsync(InputFormatterContext+context)
{
++++Check.NotNull(context,+nameof(context));

++++var+xmlDoc+=+await+LoadXmlFromRequestAsync(context.HttpContext);
++++return+InputFormatterResult.Success(xmlDoc);
}

private+static+async+Task<XDocument>+LoadXmlFromRequestAsync(HttpContext+httpContext)
{
++++Check.NotNull(httpContext,+nameof(httpContext));

++++//Code+from+Microsoft.AspNetCore.Mvc.Formatters.XmlSerializerInputFormatter+to+use+FileBufferingReadStream+to+avoid+synchronous+read+issue:
++++//https://github.com/dotnet/aspnetcore/issues/18723+-+Synchronous+call+inside+XDocument.LoadAsync+causes+-->+System.InvalidOperationException:+Synchronous+operations+are+disallowed.+Call+ReadAsync+or+set+AllowSynchronousIO+to+true+instead.
++++int+memoryThreshold+=+30720;
++++long+contentLength+=+httpContext.Request.ContentLength.GetValueOrDefault();
++++if+(contentLength+>+0+&&+contentLength+<+memoryThreshold)
++++{
++++++++memoryThreshold+=+(int)contentLength;
++++}

++++var+readStream+=+new+FileBufferingReadStream(httpContext.Request.Body,+memoryThreshold);
++++httpContext.Response.RegisterForDispose(readStream);
++++await+readStream.DrainAsync(CancellationToken.None);
++++readStream.Seek(0,+SeekOrigin.Begin);

++++try
++++{
++++++++using+(var+streamReader+=+new+StreamReader(readStream))
++++++++{
++++++++++++var+xmlDoc+=+await+XDocument.LoadAsync(streamReader,+LoadOptions.None,+CancellationToken.None);
++++++++++++return+xmlDoc;
++++++++}
++++}
++++finally
++++{
++++++++await+readStream.DisposeAsync();
++++}
}|code-block|syntax|javascript|25145|entityMap^0|0|3|25|0|5|N|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|J|3|K|5|L|7|X|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

These solutions works, but have one disadvantage in .NET Core 3 - they causes exception (inside calling XDocument.LoadAsync):
System.InvalidOperationException: Synchronous operations are disallowed. Call ReadAsync or set AllowSynchronousIO to true instead.
Here is my modified solution with FileBufferingReadStream (inspired by code from Microsoft.AspNetCore.Mvc.Formatters.XmlSerializerInputFormatter)
<pre><code>public override async Task&lt;InputFormatterResult&gt; ReadRequestBodyAsync(InputFormatterContext context)
{
 Check.NotNull(context, nameof(context));

 var xmlDoc = await LoadXmlFromRequestAsync(context.HttpContext);
 return InputFormatterResult.Success(xmlDoc);
}

private static async Task&lt;XDocument&gt; LoadXmlFromRequestAsync(HttpContext httpContext)
{
 Check.NotNull(httpContext, nameof(httpContext));

 //Code from Microsoft.AspNetCore.Mvc.Formatters.XmlSerializerInputFormatter to use FileBufferingReadStream to avoid synchronous read issue:
 //https://github.com/dotnet/aspnetcore/issues/18723 - Synchronous call inside XDocument.LoadAsync causes --&gt; System.InvalidOperationException: Synchronous operations are disallowed. Call ReadAsync or set AllowSynchronousIO to true instead.
 int memoryThreshold = 30720;
 long contentLength = httpContext.Request.ContentLength.GetValueOrDefault();
 if (contentLength &gt; 0 &amp;&amp; contentLength &lt; memoryThreshold)
 {
 memoryThreshold = (int)contentLength;
 }

 var readStream = new FileBufferingReadStream(httpContext.Request.Body, memoryThreshold);
 httpContext.Response.RegisterForDispose(readStream);
 await readStream.DrainAsync(CancellationToken.None);
 readStream.Seek(0, SeekOrigin.Begin);

 try
 {
 using (var streamReader = new StreamReader(readStream))
 {
 var xmlDoc = await XDocument.LoadAsync(streamReader, LoadOptions.None, CancellationToken.None);
 return xmlDoc;
 }
 }
 finally
 {
 await readStream.DisposeAsync();
 }
}
</code></pre>

I'm trying to post XML to asp.net core 2:

<pre><code>$.ajax({
 type: "POST",
 url: 'api/Test',
 data: "&lt;test&gt;hello&lt;test&gt;",
 contentType: "application/xml",
 success: function (response) { alert(response); },
});
</code></pre>

How should I write the action, so it accepts the xml as parameter?

<ul>
<li><code>IActionResult Post([FromBody]string xml)</code> -> xml is null</li>
<li><code>IActionResult Post([FromBody]XElement xml)</code> -> xml is null</li>
<li><code>IActionResult Post(XElement xml)</code> ->
InvalidOperationException: Could not create an instance of type 'System.Xml.Linq.XElement'. Model bound complex types must not be abstract or value types and must have a parameterless constructor.</li>
<li><code>IActionResult Post(string xml)</code> -> xml is null</li>
</ul>

in the Startup.ConfigureServices:

<pre><code>services.AddMvc()
 .AddXmlSerializerFormatters();
</code></pre>

How to write the controller so that it accepts XML as a parameter? I know I can read it from HttpContext.Request, but I want it to be parameter

Post XML to asp.net core 2.0 web api

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试将XML发布到asp.net核心2：$.ajax({ type: "POST", url: 'api/Test', data: "<test>hello<test>", contentType: "application/xml", success: function (resp...

问将XML发布到asp.net核心2.0 web api
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